It is worth saying on the page that lists the repairs, because it is the least commercial sentence here and it is true. A dishwasher that will not drain is a tub filter, an air gap, a disposal plug or a drain hose loop far more often than it is a pump — and three of those four are outside the machine. A refrigerator with a warm fresh-food side and a cold freezer is nearly always airflow rather than refrigerant. A dryer that needs three cycles is the duct, which is not the appliance.
So the visit starts with those, not with a parts order. If it turns out to be one of them, you pay for the visit and we tell you how to stop it happening again. That answer is worth the same to us either way.